Orioles Roster & Staff
Transactions
| Date | Transaction |
| 07/31/12 | Baltimore Orioles placed DH Jim Thome on the 15-day disabled list retroactive to July 29, 2012. Back Spasms |
| 07/31/12 | Robert Andino roster status changed by Baltimore Orioles. |
| 07/29/12 | Baltimore Orioles selected the contract of Lew Ford from Norfolk Tides. |
| 07/29/12 | Baltimore Orioles sent LHP Dana Eveland outright to Norfolk Tides. |
| 07/29/12 | Baltimore Orioles optioned Miguel Socolovich to Norfolk Tides. |
| 07/28/12 | Houston Astros claimed 1B Steve Pearce off waivers from Baltimore Orioles. |
| 07/27/12 | Baltimore Orioles designated Dana Eveland for assignment. |
| 07/27/12 | Baltimore Orioles recalled Miguel Socolovich from Norfolk Tides. |
| 07/26/12 | Baltimore Orioles selected the contract of LHP Dana Eveland from Norfolk Tides. |
| 07/26/12 | Baltimore Orioles optioned 3B Steve Tolleson to Norfolk Tides. |
| 07/24/12 | Baltimore Orioles signed free agent OF Henry Urrutia to a minor league contract. |
| 07/23/12 | CF Raymond Hunnicutt assigned to GCL Orioles from Baltimore Orioles. |
| 07/21/12 | Baltimore Orioles designated Steve Pearce for assignment. |
| 07/20/12 | Arizona Diamondbacks claimed RHP Brad Bergesen off waivers from Baltimore Orioles. |
| 07/20/12 | New York Mets traded SS Omar Quintanilla to Baltimore Orioles for cash. |
| 07/20/12 | New York Mets traded SS Omar Quintanilla to Baltimore Orioles for cash. |
| 07/18/12 | Baltimore Orioles recalled Tommy Hunter from Norfolk Tides. |
| 07/18/12 | Baltimore Orioles designated Brad Bergesen for assignment. |
| 07/18/12 | Baltimore Orioles signed free agent RHP Joseph Yermal to a minor league contract. |
| 07/17/12 | Baltimore Orioles signed free agent RHP Jesse Fernandez to a minor league contract. |
| 07/17/12 | Baltimore Orioles selected the contract of RHP Brad Bergesen from Norfolk Tides. |
| 07/17/12 | Baltimore Orioles recalled Zach Britton from Norfolk Tides. |
| 07/17/12 | Baltimore Orioles placed 2B Robert Andino on the 15-day disabled list retroactive to July 16, 2012. Left shoulder subluxation. |
| 07/17/12 | Baltimore Orioles optioned Miguel Socolovich to Norfolk Tides. |
| 07/17/12 | Baltimore Orioles transferred 1B Nick Johnson from the 15-day disabled list to the 60-day disabled list. |
| 07/16/12 | Baltimore Orioles recalled RHP Chris Tillman from Bowie Baysox. |
| 07/16/12 | Baltimore Orioles optioned Steve Johnson to Norfolk Tides. |
| 07/16/12 | Baltimore Orioles sent Dana Eveland outright to Norfolk Tides. |
| 07/15/12 | Baltimore Orioles recalled Steve Johnson from Norfolk Tides. |
| 07/15/12 | Baltimore Orioles placed RHP Jason Hammel on the 15-day disabled list retroactive to July 14, 2012. Right knee injury. |
| 07/14/12 | Baltimore Orioles activated C Taylor Teagarden from the 60-day disabled list. |
| 07/14/12 | Baltimore Orioles sent C Ronny Paulino outright to Norfolk Tides. |
| 07/14/12 | Baltimore Orioles designated Dana Eveland for assignment. |
| 07/14/12 | Baltimore Orioles selected the contract of Miguel Socolovich from Norfolk Tides. |
| 07/13/12 | Baltimore Orioles signed RHP Kevin Gausman. |
| 07/13/12 | Baltimore Orioles activated LF Endy Chavez from the 15-day disabled list. |
| 07/13/12 | Baltimore Orioles signed OF Raymond Hunnicutt. |
| 07/12/12 | Baltimore Orioles optioned CF Xavier Avery to Norfolk Tides. |
| 07/11/12 | Baltimore Orioles signed OF Derrick Bleeker. |
| 07/10/12 | Baltimore Orioles signed RHP Matt Price. |
| 07/09/12 | Baltimore Orioles signed RHP Branden Kline. |
| 07/09/12 | Baltimore Orioles activated RF Nick Markakis from the 15-day disabled list. |
| 07/09/12 | Baltimore Orioles optioned Joe Mahoney to Norfolk Tides. |
| 07/07/12 | Baltimore Orioles recalled Steve Tolleson from Norfolk Tides. |
| 07/06/12 | Baltimore Orioles optioned Jake Arrieta to Norfolk Tides. |
| 07/05/12 | Baltimore Orioles optioned Chris Tillman to Bowie Baysox. |
| 07/05/12 | Baltimore Orioles signed IF Christian Walker. |
| 07/05/12 | Baltimore Orioles sent Zach Phillips outright to Norfolk Tides. |
| 07/05/12 | Baltimore Orioles recalled Joe Mahoney from Norfolk Tides. |
| 07/04/12 | Baltimore Orioles recalled Chris Tillman from Norfolk Tides. |
| 07/04/12 | Baltimore Orioles optioned Steve Johnson to Norfolk Tides. |
| 07/04/12 | Chris Tillman roster status changed by Baltimore Orioles. |
| 07/03/12 | Baltimore Orioles recalled Xavier Avery from Norfolk Tides. |
| 07/03/12 | Baltimore Orioles placed 2B Brian Roberts on the 15-day disabled list retroactive to July 2, 2012. Groin strain. |
| 07/03/12 | Baltimore Orioles signed RHP Jake Pintar. |
| 07/02/12 | Baltimore Orioles optioned Brian Matusz to Norfolk Tides. |
| 07/02/12 | Baltimore Orioles recalled Steve Johnson from Norfolk Tides. |
| 07/01/12 | Philadelphia Phillies traded DH Jim Thome to Baltimore Orioles for C Gabriel Lino and RHP Kyle Simon. |
| 07/01/12 | Philadelphia Phillies traded DH Jim Thome to Baltimore Orioles for C Gabriel Lino and RHP Kyle Simon. |
| 07/01/12 | Philadelphia Phillies traded DH Jim Thome to Baltimore Orioles for C Gabriel Lino and RHP Kyle Simon. |
| 07/01/12 | Baltimore Orioles optioned RHP Tommy Hunter to Norfolk Tides. |
| 07/01/12 | Baltimore Orioles recalled RHP Miguel Gonzalez from Norfolk Tides. |
| 07/01/12 | Baltimore Orioles optioned Xavier Avery to Norfolk Tides. |